Description

I upgraded to VirtualBox version 4.2.12 on my Windows 7 host and the guest additions version 4.2.12 onto my Ubuntu 12.04 guest. Having installed the guest additions, the guest system became unusable with an error about the graphics configuration. It offered to go into low graphics mode but this didn't work either. All I could get was a command prompt. I rolled back to verion 4.2.10 with the following steps and now the system is fine again. Before the roll-back, I tried reinstalling the guest additions but it didn't help.

Rollback procedure (for the benefit of others with the same problem)

Uninstalled the guest additions in the Ubuntu guest from the command prompt

cd /opt/VBoxGuestAdditions-4.2.12

sudo ./uninstall.sh

Shutdown guest (actually I think it wouldn't shut down and I had to power it off)

I too have had this problem as well. it is reproducable. When I installed the 4.2.12 guest addition, and rebooted, I got error messages about the graphics not being configured and could not log in with full resolution. In other words, 4.2.12 breaks Ubuntu 12.04 VMs making the graphics unuseable.

I had to go back to 4.2.10, and install the 4.2.10 guest additions, removing all of 4.2.12, to get things working again. It was a big mess

Could you please try installing the 4.2.12 Additions on a fresh Ubuntu 12.04 virtual machine (or 12.04.2, depending on what you are using now) and see if that works? I can't seem to reproduce the issue here, so I hope that may provide more information.

I have the same problem, same symptoms as original poster. Fortunately I had a backup, so restored the vm. Continuing to use Vbox 4.2.12, but without updating the additions to the latest version. Anxiously awaiting a fix.

At first I attempted modifying the source on the guest OS in /usr/src/... pointing the Linux.run file to the vboxvideo SRC to the patched vboxvideo_drm.c, however the MD5 checksum failed and tried to bypass that but then there was some other error...

I gave up on that, and just used the .iso file linked above, worked fine.

f456: this change is only expected to be relevant for Ubuntu 12.04 guests (original release, not .1 or .2). Please see if you can find a ticket which better fits what you are seeing or open a new one. You will probably want to be looking at your guest system's system log file (var/log/syslog) or dmesg output and /var/log/Xorg*log* for information to help you decide if your problem matches an existing ticket. And attaching a machine log file as you did here (thank you!) is always a good idea.

Hm... Not sure how its fixed, unless you call black screen during boot up a fix.

Once upgraded to Additions .14 I can not boot up. It just hangs with black screen. I can still Ctrl-F1 to another console and uninstall guest additions and then it works. If I download GA .12 and install those everything works.

randomwhitetrash, I need more information here. At least the /var/log/vboxadd-install.log file from the guest when you installed the 4.2.14 Additions as well as /var/log/Xorg.0.log. Ubuntu 12.04 guests run fine here with 4.2.14 Additions.